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Wastewater Treatment

King County, Washington

For questions about the Wastewater Treatment Division website, please send an e-mail message or contact us at:

King Street Center
201 S. Jackson St., Suite 500
Seattle, WA 98104-3855
Phone: 206-477-5371
Fax: 206-684-1741
Telecommunication device for the deaf (TTY): 711

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Staff Contacts

53rd Avenue Pump Station upgrade

Facility operations

The pump station is located at 53rd Avenue Southwest and Alki Boulevard.
The pump station is located at 53rd Ave. SW and Alki Blvd.

Above-grade structures at the upgraded facility include air circulation vents, a generator stack, a fire hose hookup and a backflow preventer
King County designers worked with neighbors and property owners to help plan the above-ground structures required for the upgraded facility. Air circulation vents, a generator stack, a fire hose hook up and a backflow preventer are the only above ground features

The 53rd Avenue Pump Station is an underground facility located under the pedestrian and bike way along Alki Avenue.
Facility access hatches are located next to the pedestrian and bike way along Alki Avenue.

Completed winter 2010

From spring 2008 to winter 2010 King County rebuilt the ageing 53rd Avenue Pump Station and added new odor control equipment, upgrades to the facility’s electrical and mechanical systems, and doubling the size of the below-ground facilities. This facility will provide safe, reliable service for the next 50 years in the Alki area of Seattle.

The renovated pump station can pump 17 million gallons of wastewater per day to the county's regional treatment plant at West Point in Seattle.

Major changes to pump station

  • Expanded pump station vault to the west 70 feet
  • New pumps and associated mechanical equipment
  • New odor control equipment
  • Standby generator
  • All new electrical and control system

Station tour

53rd Ave Pump Station Tour
View more photos (external link, Flickr).

Project updates